1. Department of Environmental and Preventive Medicine Oita University Faculty of Medicine Yufu Japan
2. The Research Center for GLOBAL and LOCAL Infectious Diseases (RCGLID) Oita University Yufu Japan
3. Department of Medicine, Gastroenterology and Hepatology Section Baylor College of Medicine Houston Texas USA
4. Division of Gastroentero‐Hepatology, Department of Internal Medicine, Faculty of Medicine‐Dr. Soetomo Teaching Hospital Universitas Airlangga Surabaya Indonesia